Bolt-anchor.



J. KARITZKY.

BOLT ANCHOR. I

APPLICATION FILED APR. 9. (9X8.

1,295,328. Patnted Feb. 25, 1919.

A/l/E/VTOR v 8% A TTOR/VEY TED STATES PATENT oE Io JOHN KABITZKY, OF GARWOOD, NEW JERSEY, ASSIGNOR TO GARWOOID COMPANY, A

CORPORATION OF NEW JERSEY.

BOLT-ANCHOR.

Specification of Letters Patent.

Patented Feb. 25, 1919.

To all whom it may concern:

Be it known that 1, JOHN KARITZKY, a citizen of the United States, and residing at Garwood, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bolt-Anchors, of which the following is a specification, taken in connection with the accompanying drawing.

My invention relates to a bolt anchor having a plurality of cooperatin expanding members and to means for hol ing them together, without the aid of a bolt or screw, said means being an element of the bolt anchor and serving to transmit the strains of the expanding members directly to the wall of the support when the bolt anchor is expanded.

My invention further relates to certain details of construction and combinations which will be more fully described in the specification and pointed. out in the clalms.

I have shown in the accompanymg drawing one embodiment of my invention, but of course it is to be understood that my invention is not to be confined to the particular form shown by way of example, except as required by the scope of my claims.

In the drawing the same reference numerals refer to similar parts in the several figures. a

Figure 1 is a longitudinal vertical section through my improved'bolt anchor, a sup-,

port, and the work supported. Fig. 2 is a transverse vertical sectlon on the line 22 of Fig. 1 looking in the direction of the arrows.

Fig. 3 is a side elevation showlng the bolt anchor assembled and ready for shipment, one of the expanding members being broken away to show that its bore is screwthreaded.

Fig. 4 is a plan view of the blank from which the bendable shield or cage is formed.

Fig. 5 is a plan view of one of the expandmg members. r

In the illustrative embodiment of my invention shown in the drawing, 1 is a bolt anchor formed of expanding members 2 and 3, with means for holding them together and in alinement with each other. In the form I have illustrated this means is a Z shaped shield or cage 4: having an upper portion 5, a lower portion 6, and a diagonal slotted portion 7.

The expanding members 2 and 3 are preferably formed of rigid material. For the sake of economy in manufacture they are preferably cast. They are each provided with inclined cooperating expanding surfaces 8, which are formed hollow to permit the passage of a'boltor screw, or other expanding member 9, and are preferably provided with a slot 10 to receive a cooperating lug 11 on the opposite complementary expanding member. This lug 11 is provided with an inclined surface 12 and preferably with a recess, niche, or cut away portions 13. Each expanding member is also preferably provided with a niche or recess 14 located substantially 180 from the one on the lug.

The shield or cage 4: is preferably formed from a steel stamping 15 Fig. 4 which when bent upon itself, as shown in Fig. 3, forms substantially a Z shaped member with the diagonal member 7 slotted. This shield or cage is preferably provided with the integral fingers 16 to snap into the cut away portions or recesses 13, 13 in the lugs 11, 11, and with fingers 17, 17 to snap into the niches, recesses or notches 14, 14 in the expanding members 2 and 3.

In assembling my bolt anchor for shipping it is only necessary to press the respective expanding members 2 and 3 into the Z shaped shield or cage so that the lugs 11, 11 will move in the slot 18 formed in the diagonal member 7 until the members snap into their proper positions. The diagonal members 7 of the shield or cage conforms with, and lies between the inclined cooperating surfaces 8, 8 of each of the expanding members 2 and 3. This assembling may be done by girls or other unsln'lled labor.

When my expansion bolt has been assembled, as shown in Fig. 3, it may be shipped, stored or handled without danger of becoming disassembled for the parts will stay in the position shown in this figure without the aid of the screw or bolt 9. This is a great advantage, as my expansion bolt may be sold as a unit. This permits the user to go to any hardware store and purchase screws or bolts to cooperate with any particularsize' bolt anchor, though, of course, Where the" screws or bolts are ordered from the manufacturer of the bolt anchors they maybe shipped .in separate cartons or containers if desired.

The inner expanding member 2 has screw threads cast or tapped, as the case may be, upon its interior bore, while the interior of the other expanding'member 3 is unthreaded, Fig. 1.

Preferably, though not necessarily, the expanding members2 and 3 are cylindrical the-members 5 and 6v of the cage or shield are pressed to form an exterior convex surface to conform to the cylindrical surfaces of the members 2 and 3.

' In use a hole 20. of the proper diameter is drilled, or otherwise made in the support 21 which may be of any material, and the bolt anchor 1 is then placed in the hole 20 with the expanding member 2 at the point farthes't removed from the surface 22 of the ;v support. The work 23 is then brought into expanding member 3 and through the slot' of the diagonal member 7-, until it engages with the screw threads of the expanding member 2. By then rotating the screw or bolt 9 the cooperating inclined surfaces 8, 8 are caused to move up the diagonal member 7, which lies between them, this movement ,7 serving to draw the two expanding members 2: and. 8v together and force them radially with relation to the longitudinal axis of the bolt, anchor. This radial movement is guided first by the sides of the lugs 11, 11

cooperating with the slotted diagonal member 7 until such time, if the expansion is continued, until the ends 24, 24 of the lugs 11, 11 are received in the slots 10, 10 of the complementary expanding members 2 and 3.

This serves further to guide the expanding members 2 and 3 and to prevent them movingsidewise on each other or out of alinement. This insures that the axis of the bolt anchor will coincide with the axis of the hole 20 in the support, and that the shield or cage & will be expanded uniformly as the members 2 and 3 move radially as shown in Fig. 1 and that the bolt anchor will be properly centered in the hole 20.

Having thus described this invention in connection with an illustrative embodiment thereof to the details of which I do not desire to be limited, exceptas required by the scope of the appended claims, what is claimed as new and what is desired to secure by Letters Patent is set forth in the appended claims.

1'. In a bolt anchorthe combinationof a plurality of expanding members having inclined surfaces, and yielding means cooperating. with said expanding members and 2. In a bolt anchor the combination of a,

plurality of expanding members having inclined surfaces, and a bendable shield 00- operating with said expanding members and with said inclined surfaces to hold the expanding members together.

3. In a bolt anchor the combination of a plurality of expanding members having wedge surfaces and yielding means having a part between the wedge surfaces and adapt ed to hold the expanding members together without the aid of a bolt or screw.

4. In a bolt anchor the combination of a plurality of expanding members having Wedge surfaces and a bendable shield having a part mounted between the wedge surfaces and adapted to hold the expanding members together without the aid of a bolt or screw.

5. In a bolt anchor the combination of a plurality of substantially cylindrical expanding members having cooperating wedge surfaces and yielding means having a part,

mounted between the wedge surfaces and adapted to yieldingly hold the cylindrical expanding members together.

6. In a bolt anchor the combination of a plurality of substantially cylindrical expanding members having cooperating wedge surfaces and a bendable shield having a portion mounted between the wedge surfaces and adapted to yieldingly hold the cylindrical expanding members together.

7. An article of manufacture comprising a bolt anchor having a plurality of substantially rigid expanding members provided with inclined surfaces, anda yielding expansible shield holding the members together without the aid of a bolt or screw.

8. An article of manufacture comprising a bolt anchor having a plurality of substantially rigid expanding members provided with inclined surfaces, and a yielding expansible shield having a portion cooperating with the inclined surfaces and another portion cooperating with the rigid expanding members to hold them together without the aid of a bolt or screw.

9. An article of manufacture comprising a bolt anchor having a plurality of rigid exoperating inclined expanding surfaces and with lugs, and a yieldable expansible shield having a part thereof between the inclined surfaces of the expanding members and provided with means engaging with said lugs.

11. In a bolt anchor the combination of ber to prevent them moving transversely tWo liembersdprovideg with cgoperlatilng inwith relation to the shield. cline ex an ing sur aces an Wit u s, a

z-shaped shield having its diagonal mer nber JOHN KARITZKY' 5 between the inclined surfaces and cut away Witnesses:

to permit the passage of a bolt or screw and DAVID TULLOCH, to straddle the lugs of the expanding mem- FREDERICK STAUSS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atenta, Washington, D. 0. 

